476.objection to (接动名词) 反对
477.on occasion (=now and then) 不时地，必要时
478.by occasion of (because of ) 由于
479.occupy oneself with (in) 忙于 (某事)
480.it occurs to sb. that…… 某人想到……
481.once and for all = once and forever永远地 all at once (=suddenly， now) 立即，马上 once in a while (=occasionally) 偶尔 (just) for once就这一次
482.(all) by oneself 独自 (没有别人帮助)
483.operate on sb. 给某人做手术 operation n.come/ go into operation 开始运转 put/bring sth. into operation 使……投产，运转
484.be of the opinion 持有……的看法
485.in one‘s opinion 按某人的看法
486.be opposed to…… 反对……
487.be opposite to与……相反的
488.(be) in order (=acceptable) 合适的，恰当的in order井井有条，处于良好状态;out of order (=in bad condition) 出毛病，发生故障
489.made to order 定做的 (衣服)
490.originate in/from (=begin) 起源于，由……引起
491.on the outskirts (of) 在城郊
492.owe……to 把……归于……
493.on one‘s own (=along， without help) 单独
494.of one‘s own某人自己的
495.keep pace with 跟……齐步前进
496.go to great pains = take pains下功夫，努力
497.part with (=give up， sell) 舍弃，卖掉
498.participate in (=take part in) 参加
499.(be) particular about 讲究，挑剔 (吃，穿)
500.in particular (=especially) 特别是，尤其
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